C++: Actually fix incorrect annotation

Author: MathiasVP

cpp/ql/test/query-tests/Likely Bugs/Memory Management/UsingExpiredStackAddress/test.cpp

@@ -77,7 +77,7 @@ int test_pointer_arith_good_1() {
   int x;
   address_escapes_through_pointer_arith();
   s101.p = &x;
-  return *s101.p; // GOOD [FALSE POSITIVE]
+  return *s101.p; // GOOD
 }
 
 int test_pointer_arith_good_2(bool b) {
@@ -196,4 +196,4 @@ void test_not_escape_through_array() {
   int x20 = s1.a1[0]; // GOOD
   int x21 = s1.a2[0][1]; // GOOD
   int* x22 = s1.a3[5][2]; // GOOD
-}
+}